Stone,

Your ultra mag is a cartridge made to be handloaded. You can reload a more accurate and powerful load over the factory one.

I hate to boast but all these wildcat magnums won't sit on the shelf forever. And remington is losing to winchester bigtime. Especially in the short action magnum class. I did think some of the remington ultra mags would last. Its hard to beat the 7mm STW for being the power house but the RUM seems to have a bit more ummph.

I have never understood Remingtons reason for discontinuing the 8mm rem mag. As far as a big bore round it was one that had both power and tragectory. Things change and some don't last the test of times. But I think as long as you stock up on cases for reloading you won't have a problem.